Unlocking High Capacity and Fast Na<sup>+</sup> Diffusion of H<sub>x</sub> CrS<sub>2</sub> by Proton-Exchange Pretreatment.
basic_science · Level V
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- Record sourced from PubMed, PMID 36594103.
- Also identified by DOI 10.1002/adma.202209811.
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Abstract
This study presents a new material, "H<sub>x</sub> CrS<sub>2</sub> " (denotes approximate composition) formed by proton-exchange of NaCrS<sub>2</sub> which has a measured capacity of 728 mAh g<sup>-1</sup> with significant improvements to capacity retention, sustaining over 700 mAh g<sup>-1</sup> during cycling experiments. This is the highest reported capacity for a transition metal sulfide electrode and outperforms the most promising proposed sodium anodes to date. H<sub>x</sub> CrS<sub>2</sub> exhibits a biphasic structure featuring alternating crystalline and amorphous lamella on the scale of a few nanometers. This unique structural motif enables reversible access to Cr redox in the material resulting in higher capacities than seen in the parent structure which features only S redox. Pretreatment by proton-exchange offers a route to materials such as H<sub>x</sub> CrS<sub>2</sub> which provide fast diffusion and high capacities for sodium-ion batteries.